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cache_bin: Separate out local and remote accesses.

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This fixes an incorrect debug-mode assert:
- T1 starts an arena stats update and reads stack_head from another thread's
  cache bin, when that cache bin has 1 item in it.
- T2 allocates from that cache bin.  The cache_bin's stack_head now points to a
  NULL pointer, since the cache bin is empty.
- T1 Re-reads the cache_bin's stack_head to perform an assertion check (since it
  previously saw that the bin was empty, whatever stack_head points to should be
  non-NULL).
This commit is contained in:
David Goldblatt
2021-01-07 13:22:08 -08:00
committed by David Goldblatt
parent 14d689c0f9
commit a011c4c22d
5 changed files with 70 additions and 36 deletions
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src/cache_bin.c
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@@ -83,7 +83,7 @@ cache_bin_init(cache_bin_t *bin, cache_bin_info_t *info, void *alloc,
bin->low_bits_empty = (uint16_t)(uintptr_t)empty_position;
assert(cache_bin_diff(bin, bin->low_bits_full,
(uint16_t)(uintptr_t) bin->stack_head) == bin_stack_size);
assert(cache_bin_ncached_get(bin, info) == 0);
assert(cache_bin_ncached_get_local(bin, info) == 0);
assert(cache_bin_empty_position_get(bin) == empty_position);
assert(bin_stack_size > 0 || empty_position == full_position);